diff --git a/serialport/proguard-rules.pro b/serialport/proguard-rules.pro
new file mode 100644
index 0000000..ded416c
--- /dev/null
+++ b/serialport/proguard-rules.pro
@@ -0,0 +1 @@
+IyBBZGQgcHJvamVjdCBzcGVjaWZpYyBQcm9HdWFyZCBydWxlcyBoZXJlLgota2VlcCBjbGFzcyBhbmRyb2lkLnNlcmlhbHBvcnQudXRpbHMuU2VyaWFsQ2FyZENvbnRyb2wgewogICAgYW5kcm9pZC5zZXJpYWxwb3J0LnV0aWxzLlNlcmlhbENhcmRDb250cm9sIGdldFNlcmlhbEFsYXJtSW5zdGFuY2UqKC4uLik7Cn0KLWtlZXAgY2xhc3MgYW5kcm9pZC5zZXJpYWxwb3J0LnV0aWxzLlRhc2tFeGN1dGVSZXN1bHQgeyAqOyB9
\ No newline at end of file